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Add kern.elf{32,64}.vdso knobs to enable/disable vdso preloading

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Reviewed by:	emaste
Discussed with:	jrtc27
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
MFC after:	1 month
Differential revision:	https://reviews.freebsd.org/D32960
This commit is contained in:
Konstantin Belousov 2021-11-25 03:31:27 +02:00
parent 98c8b62524
commit eb02958748
1 changed files with 10 additions and 1 deletions
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11
sys/kern/imgact_elf.c
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@ -129,6 +129,15 @@ SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
nxstack, CTLFLAG_RW, &__elfN(nxstack), 0,
__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable non-executable stack");
#if defined(__amd64__)
static int __elfN(vdso) = 1;
SYSCTL_INT(__CONCAT(_kern_elf, __ELF_WORD_SIZE), OID_AUTO,
vdso, CTLFLAG_RWTUN, &__elfN(vdso), 0,
__XSTRING(__CONCAT(ELF, __ELF_WORD_SIZE)) ": enable vdso preloading");
#else
static int __elfN(vdso) = 0;
#endif
#if __ELF_WORD_SIZE == 32 && (defined(__amd64__) || defined(__i386__))
int i386_read_exec = 0;
SYSCTL_INT(_kern_elf32, OID_AUTO, read_exec, CTLFLAG_RW, &i386_read_exec, 0,
@ -1414,7 +1423,7 @@ __elfN(freebsd_copyout_auxargs)(struct image_params *imgp, uintptr_t base)
AUXARGS_ENTRY_PTR(pos, AT_PS_STRINGS, imgp->ps_strings);
if (imgp->sysent->sv_fxrng_gen_base != 0)
AUXARGS_ENTRY(pos, AT_FXRNG, imgp->sysent->sv_fxrng_gen_base);
if (imgp->sysent->sv_vdso_base != 0)
if (imgp->sysent->sv_vdso_base != 0 && __elfN(vdso) != 0)
AUXARGS_ENTRY(pos, AT_KPRELOAD, imgp->sysent->sv_vdso_base);
AUXARGS_ENTRY(pos, AT_NULL, 0);